* {
	margin: 0;
	padding: 0;
	font-family: "microsoft yahei";
}
ul, ol {
	list-style: none;
}
a {
	text-decoration: none;
}
.w1200 {
	width: 1200px;
	margin: 0 auto;
	height: auto;
}
.w1200:after {
	content: "";
	width: 0;
	height: 0;
	display: block;
	clear: both;
}
.ai_card {
	width: 100%;
	height: auto;
	overflow: hidden;
	padding-bottom: 80px;
}
.ai_card h2.t {
	padding-top: 80px;
	font-size: 36px;
	text-align: center;
	font-weight: normal;
}
.ai_card p.sub_t {
	padding-top: 15px;
	font-size: 16px;
	text-align: center;
	padding-bottom: 60px;
}
.ai_card ul {
	padding-bottom: 70px;
}
.ai_card ul li {
	float: left;
	position: relative;
	width: 33%;
	height: 428px;
	border: 1px solid #e7e7e7;
	margin-left: -1px;
	z-index: 10;
}

.ai_card ul li:before {
	content: "";
	width: 0px;
	height: 2px;
	background: #00b8ff;
	top: 0;
	left: 0;
	position: absolute;
	z-index: 999;
	transition: 1s;
}
.ai_card ul li .info {
	position: absolute;
	top: 80px;
	width: 100%;
	left: 0;
	transition: 0.5s;
}
.ai_card ul li .info .img {
	width: 100%;
	height: 90px;
	text-align: center;
}
.ai_card ul li .info h3 {
	font-weight: normal;
	color: #333;
	padding-top: 30px;
	padding-bottom: 25px;
	font-size: 24px;
	text-align: center;
}
.ai_card ul li .info p {
	width: 80%;
	height: 85px;
	line-height: 24px;
	margin: 0 auto;
	color: #73747b;
	font-size: 14px;
}
.ai_card ul li a.btn {
	position: absolute;
	width: 120px;
	height: 40px;
	line-height: 40px;
	display: block;
	left: 50%;
	margin-left: -60px;
	bottom: 50px;
	color: #fff;
	background: #00b8ff;
	opacity: 0;
	border-radius: 2px;
	transition: 0.5s;
	font-size: 16px;
	text-align: center;
}
.ai_card ul li.active {
	box-shadow: 0 2px 20px rgba(175, 175, 175, 0.3);
}
.ai_card ul li.active:before {
	width: 398px;
	height: 2px;
}
.ai_card ul li.active .info {
	top: 50px;
	transition: 0.5s;
	-moz-transition: 0.5s;
	-webkit-transition: 0.5s;
	-o-transition: 0.5s;
}
.ai_card ul li.active a.btn {
	opacity: 1;
}
